221414671647666 has 48 divisors (see below), whose sum is σ = 568571008684224. Its totient is φ = 63261334755504.

The previous prime is 221414671647629. The next prime is 221414671647713. The reversal of 221414671647666 is 666746176414122.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32541835465 + ... + 32541842268.

It is an arithmetic number, because the mean of its divisors is an integer number (11845229347588).

Almost surely, 2^{221414671647666} is an apocalyptic number.

221414671647666 is an abundant number, since it is smaller than the sum of its proper divisors (347156337036558).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

221414671647666 is an equidigital number, since it uses as much as digits as its factorization.

221414671647666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65083677757 (or 65083677745 counting only the distinct ones).

The product of its digits is 97542144, while the sum is 63.

The spelling of 221414671647666 in words is "two hundred twenty-one trillion, four hundred fourteen billion, six hundred seventy-one million, six hundred forty-seven thousand, six hundred sixty-six".